JPS5913698B2 - Gas leak detection alarm method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is capable of detecting gas leaks indoors and notifying the indoor and outdoor areas according to the extent of the gas leaks, as well as interlocking ventilation fans, gas switches, etc. The present invention relates to a gas leak detection and alarm method.

Recently, major accidents due to gas leaks such as city gas and LPG have occurred one after another, and preventive measures are urgently needed. Conventional gas leak detection for gas leaks! 5 Various types of devices have been proposed and put into practical use. The methods can be roughly divided into semiconductor type, catalytic combustion type, and solid heat conduction type. On the other hand, the desired characteristics of a gas leak detector are that it is sensitive to so-called miscellaneous gases other than the target gas, and that it has sufficient initial stabilization time. 0 It is short, has sufficient resistance to temperature shock, humidity shock, vibration, etc., has stable sensitivity over a long period of time, has little effect on gas sensitivity due to temperature, humidity, voltage, etc., and has a large electrical output. Low power consumption, stable CH4 gas sensitivity,
etc., but no single method has been found that satisfies all of them. On the other hand, if the above-mentioned gas leak detector is used to output an alarm signal and a large number of units are centrally managed in a manager's room, it may be possible to easily save labor, but as mentioned above, Since there is no gas leak detector that satisfies all the required characteristics, it is not practical as stated below. In other words, what would happen if, for example, the gas leak detectors (including the gas leak alarms that detect gas leaks and issue alarms) in each of the 100 housing units were centrally monitored in the manager's room? Thinking about it, if an alarm goes off in the manager's room, each ■5
If there is a gas leak in one of the units and the gas leak detector is activated, if any of the units activates the gas leak detector, or if there is a mistake in igniting the gas appliance in one of the units, etc. If the gas leak detector is activated for a short period of time, if one of the households sprays insecticide, etc. on the gas leak detector, if the power is retransmitted after a power outage (when the power is retransmitted once the power is cut off) Until a certain period of time has passed,
The operation is similar to gas leak detection).

So, for example, even if we check the operation of each house once a month, the alarm will go off 100 times in the manager's room due to something other than the original gas leak, making it completely impossible to find gas leaks. I get used to it. This invention has been developed in consideration of the above points, and is designed to prevent unnecessary alarms from being generated as much as possible, and to issue a signal to the manager's room only when it is truly necessary.

The present invention will be explained below with reference to the drawings. The drawing is a block diagram showing an embodiment of the present invention.

In this figure, A is a room where gas leaks need to be detected, and a gas leak detection alarm 10, a ventilation fan 20, a gas switch 30, a spark safety device 40, etc. are installed. B is outdoors, and an external relay alarm 50 is installed. C is a monitoring room such as a manager's room, in which a central alarm monitoring panel 60 is installed. Each part will be explained below. The gas leak detection alarm 10 is equipped with a blue lamp 11, a red lamp 12, a buzzer 13, a gas switch close lamp 14, etc., and when indoor A is normal, only the blue lamp 11 is turned on and the alarm is turned on. If there is a gas leak, it is detected, a blue lamp 11 and a red lamp 12 are alternately flashed, and a ventilation fan 20 is started at the same time.

Furthermore, when the gas concentration reaches a preset dangerous concentration, the blue lamp 11 is turned off, only the red lamp 12 is turned on, and the buzzer 13 is sounded. Furthermore, if the Puzzle 13 continues to chirp for more than 1 minute, it generates a pulse, and this pulse closes the solenoid valve of the gas switch 30 to cut off the gas supply, and at the same time activates the spark safety device 40. ,
The gas switch close lamp 14 of the gas leak detection alarm 10 is turned on to indicate gas cutoff. However, the gas leak detection alarm 10 also sounds when the casing of the gas leak detection alarm 10 is touched. The external relay alarm 50 has a check button 51
, a red lamp 52, a yellow lamp 53, and a puzzle 54. By pressing the check button 51, it is possible to check whether the display and alarm operation are normal.

The blue lamp 11 of the gas leak detection alarm 10 installed in room A is turned off and only the red lamp 12 is lit.
3. At the same time, the red lamp 52 of the external relay alarm 50 is lit to indicate to the outdoor B that the gas leak in the room A has reached a dangerous concentration, and the gas leak detection alarm 10 is turned on. When the alarm 13 continues to sound for 30 seconds or more, the alarm 54 of the external relay alarm 50 is caused to sound. In the case of the external relay alarm 50, the buzzer 54 also sounds when the housing is touched. This external relay alarm 50 may be placed in one-to-one correspondence with the gas leak detection alarm 10, or may be shared with the gas leak detection alarm 10 in the neighborhood and installed in a hallway or the like. If there is an abnormality in the connection between the gas leak detection alarm 10 and the external relay alarm 50, a yellow light 5
3 lights up to indicate an abnormality. The central alarm monitoring board 60 is
Inspection button 61. A red alarm lamp 62, a warning lamp 63, and a unit corresponding to the gas leak detection alarm 10 in room A are equipped with an alarm lamp 64, a trouble lamp 65, a location display board 66, etc., and when the check button 61 is pressed, It is possible to check whether all alarm circuits are operating normally.

When the buzzer 54 of the external relay alarm 50 rings continuously for 30 seconds or more, the buzzer 63 of the central alarm monitoring panel 60
The alarm starts to sound, and at the same time the alarm red lamp 62 lights up to notify that an abnormality has occurred. Before this, the buzzer 54 of the external relay alarm 50 outside the room B is activated and the alarm lamp 64 is lit at the same time, so in the monitoring room C, which room can be accessed from the location display board 66 of the area where the alarm lamp 64 is lit? You can immediately know if there is a gas leak. In the unlikely event that there is an abnormality in the connection between the central alarm monitoring panel 60 and the gas leak detection alarm 10 or the external relay alarm 50, the trouble lamp 65 at the corresponding location will light up to indicate the abnormality in the connection. . Next, the overall operation of FIG. 1 will be explained.

Indoor AK$? (I checked the gas leak detection alarm 10), if there is a temporary power outage and the electricity is retransmitted, or if there is a slight gas leak or short-term abnormality such as when spraying or ignition error, the gas leak detection alarm 10 should be Red lamp 1 of leak detection alarm 10
2 and the blue lamp 11 flash alternately, the ventilation fan 20 starts, and nothing is displayed on the external relay alarm 50 or the central alarm monitoring board 60 where the Puzzle 13 sounds. This is the first stage warning display. If a real gas leak occurs in the room A and reaches a dangerous concentration, the blue lamp 11 will turn off, only the red lamp 12 will turn on, the Puzzle 13 will be activated, and at the same time the external relay alarm in the outside B will be activated. 50 red lamps 52
lights up.

If this state continues for 30 seconds or more, the buzzer 54 starts to sound and the alarm lamp 64 of the unit on the corresponding location display board 66 of the centralized alarm monitoring panel 60 in the monitoring room C lights up. This is the second stage alarm display. When the gas leak reaches a dangerous concentration and continues for more than 1 minute after the gas leak in room A starts to sound, the gas switch 30 is closed to cut off the gas supply, and the gas switch close lamp of the gas leak detection alarm 10 is activated. 14 lights up to indicate that the operation is complete.

On the other hand, when the buzzer 54 of the external relay alarm 50 outside the room B continues to ring for 30 seconds or more, the alarm red lamp 62 and the buzzer 63 of the central alarm monitoring panel 60 are activated for the first time.

This is the third stage of alarm display and activation. In this way, in the first stage, only indoor A is displayed and the ventilation fan is activated, and in the second stage, a person is sent to notify indoor A, display outdoor B, and display an alarm and gas leak location in monitoring room C. At the third stage, the final danger display and notification are issued to the monitoring room C, and the indoor AVC $:? In some cases, the gas supply is cut off.

Since the gas leak detector itself used in the gas leak detection alarm device 10 described above is well known, its details will be omitted.

Furthermore, whether or not the gas leak has reached a dangerous concentration may be determined by comparing the output voltage of the gas leak detector with a preset reference value using a well-known comparison circuit. Further, to determine whether or not the period has continued for a certain period of time, it is sufficient to start an arbitrary timer circuit from the time when the output is obtained from the comparison circuit, and to determine based on a predetermined output of this timer circuit. Furthermore, it is convenient to use light emitting diodes as the various lamps, and the gas switch 30 is configured to be manually reset.

Further, it goes without saying that a range hood or the like can be used in place of the ventilation fan 20. As explained in detail above, the present invention is composed of a gas leak detection alarm, an external relay alarm, and a central alarm monitoring panel, and the detection status of the gas leak detection alarm is divided into three stages. Flashing blue and red lamps and operation of ventilation fans are performed, and in the second stage, a buzzer is activated inside the room, and for the first time, an external relay alarm is used to display and notify the outside of the room, as well as a central alarm monitoring panel. Only the location was displayed, and in the third step, the gas passing part of the gas appliance was closed, and an alarm was issued for the first time in the monitoring room, so every minor accident in the monitoring room could be mistaken for mischief. This has the advantage that there are no new displays or warnings, so only true accidents can be accurately identified, and leaked gas can be automatically exhausted by the ventilation fan that operates in the first stage.

[Brief explanation of drawings]

The drawings are block diagrams showing one embodiment of the present invention. In the figure, A is indoors, B is outdoors, C is a monitoring room, 10 is a gas leak detection alarm, 11 is a blue lamp, 12 is a red lamp, 13
is a buzzer, 14 is a gas switch close lamp, 20 is a ventilation fan,
30 is a gas switch, 40 is a flame safety device, 50 is an external relay alarm, 51 is an inspection button, 52 is a red lamp, 53 is a blue lamp, 54 is a buzzer, 60 is a central alarm monitoring panel, 61
is the inspection button, 62 is the warning red lamp, 63 is the buzzer, 6
4 is a warning lamp, 65 is a trouble lamp, and 66 is a location display board.

Claims (1)

[Claims] 1 Consisting of a gas leak detection alarm installed indoors, an external relay alarm installed outdoors, and a central alarm monitoring panel installed in a monitoring room, the gas leak detection alarm detects gas leaks in the room. Display this when it occurs, and
The ventilation fan is operated, and when the gas leak reaches a preset dangerous concentration, the red lamp and buzzer are activated to display and notify the user, and when the dangerous concentration continues for more than a predetermined time, the gas passing section of the gas appliance is turned off. On the other hand, when the gas leak reaches a dangerous concentration by the external relay alarm, a red lamp immediately indicates this outside the room, and furthermore, when the dangerous concentration of the gas leak continues for a set time or more, a buzzer is activated. The central alarm monitoring panel activates the buzzer of the external relay alarm and at the same time lights up an alarm lamp indicating the location of the gas leak to indicate the location of the gas leak, thereby detecting the gas leak inside the room. A gas leak alarm method characterized in that when a dangerous concentration of gas continues for more than a predetermined time, a red alarm lamp and a buzzer display and notify this.